<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="test"></div>
    <script src="./js/react.development.js"></script>
    <script src="./js/react-dom.development.js"></script> 
    <script src="./js/babel.min.js"></script>
    <script type="text/babel">
        class Test extends React.Component {
            myref = React.createRef()
            handlerfunction = () => {

                alert(this.myref.current.value)
            }
            blurtest = () => {

            }
            render() {
                return (
                    <div>
                        <input ref={this.myref} type="input" /><br />

                        <button onClick={this.handlerfunction}>点击我</button><br />
                        <input onBlur={this.blurtest} type="input" /><br />
                    </div>
                )
            }

        }
        ReactDOM.render(<Test />, document.getElementById('test'))
    </script>
</body>

</html>